// spriteOperations.ts
import { type Sprite } from '@/application/types';
import { sprites, cellSize, canvas, ctx, columns } from '@/application/state';
import { logger, getSpriteOffset } from '@/application/utilities';
import { updateCanvasSize, renderSpritesheetPreview } from '@/application/canvasOperations';

/**
 * Add new sprites to the spritesheet
 */
export function addSprites(newSprites: Sprite[]) {
  if (newSprites.length === 0) {
    logger.warn('Attempted to add empty sprites array');
    return;
  }

  try {
    // Validate sprites before adding them
    const validSprites = newSprites.filter(sprite => {
      if (!sprite.img || sprite.width <= 0 || sprite.height <= 0) {
        logger.error('Invalid sprite detected', sprite);
        return false;
      }
      return true;
    });

    if (validSprites.length === 0) {
      logger.error('No valid sprites to add');
      return;
    }

    sprites.value.push(...validSprites);
    sprites.value.sort((a, b) => a.uploadOrder - b.uploadOrder);

    // Update cell size before arranging sprites
    updateCellSize();
    autoArrangeSprites();
  } catch (error) {
    logger.error('Error adding sprites:', error);
  }
}

/**
 * Update the cell size based on the largest sprite dimensions
 */
export function updateCellSize() {
  if (sprites.value.length === 0) {
    return;
  }

  try {
    let maxWidth = 0;
    let maxHeight = 0;

    // Find the maximum dimensions across all sprites
    sprites.value.forEach(sprite => {
      if (!sprite.img || sprite.width <= 0 || sprite.height <= 0) {
        logger.warn('Sprite with invalid dimensions detected', sprite);
        return;
      }
      maxWidth = Math.max(maxWidth, sprite.width);
      maxHeight = Math.max(maxHeight, sprite.height);
    });

    if (maxWidth === 0 || maxHeight === 0) {
      logger.error('Failed to calculate valid cell size');
      return;
    }

    // Add a small buffer to ensure sprites fit completely (optional)
    const buffer = 0; // Increase if you want padding between sprites
    cellSize.width = maxWidth + buffer;
    cellSize.height = maxHeight + buffer;

    // Ensure all sprites are within their cell bounds after resize
    sprites.value.forEach((sprite, index) => {
      const column = index % columns.value;
      const row = Math.floor(index / columns.value);

      // Calculate base position for the sprite's cell
      const cellX = column * cellSize.width;
      const cellY = row * cellSize.height;

      // Center the sprite within its cell if smaller than cell size
      const offsetX = Math.floor((cellSize.width - sprite.width) / 2);
      const offsetY = Math.floor((cellSize.height - sprite.height) / 2);

      sprite.x = cellX + offsetX;
      sprite.y = cellY + offsetY;
    });

    updateCanvasSize();
    renderSpritesheetPreview();
  } catch (error) {
    logger.error('Error updating cell size:', error);
  }
}

/**
 * Automatically arrange sprites in a grid
 */
export function autoArrangeSprites() {
  if (sprites.value.length === 0) {
    return;
  }

  try {
    if (cellSize.width <= 0 || cellSize.height <= 0) {
      logger.error('Invalid cell size for auto-arranging', cellSize);
      return;
    }

    // First update the canvas size to ensure it's large enough
    updateCanvasSize();

    // Then position each sprite in its grid cell
    sprites.value.forEach((sprite, index) => {
      const column = index % columns.value;
      const row = Math.floor(index / columns.value);

      sprite.x = column * cellSize.width;
      sprite.y = row * cellSize.height;
    });

    // Check if the canvas is ready before attempting to render
    if (!ctx.value || !canvas.value) {
      logger.warn('Canvas or context not available for rendering after auto-arrange');
      return;
    }

    renderSpritesheetPreview();
  } catch (error) {
    logger.error('Error auto-arranging sprites:', error);
  }
}

/**
 * Highlight a specific sprite by its ID
 */
export function highlightSprite(spriteId: string) {
  if (!ctx.value || !canvas.value) return;

  const sprite = sprites.value.find(s => s.id === spriteId);
  if (!sprite) return;

  // Calculate the cell coordinates
  const cellX = Math.floor(sprite.x / cellSize.width);
  const cellY = Math.floor(sprite.y / cellSize.height);

  // Briefly flash the cell
  ctx.value.save();
  ctx.value.fillStyle = 'rgba(0, 150, 255, 0.3)';
  ctx.value.fillRect(cellX * cellSize.width, cellY * cellSize.height, cellSize.width, cellSize.height);
  ctx.value.restore();

  // Reset after a short delay
  setTimeout(() => {
    renderSpritesheetPreview();
  }, 500);
}

/**
 * Clear all sprites and reset the canvas
 */
export function clearAllSprites(animation: any) {
  if (!canvas.value || !ctx.value) return;

  sprites.value = [];
  canvas.value.width = 400;
  canvas.value.height = 300;
  ctx.value.clearRect(0, 0, canvas.value.width, canvas.value.height);

  if (animation.canvas && animation.ctx) {
    animation.canvas.width = 200;
    animation.canvas.height = 200;
    animation.ctx.clearRect(0, 0, animation.canvas.width, animation.canvas.height);
  }

  animation.currentFrame = 0;
}

/**
 * Apply frame-specific offsets to the main sprite positions
 */
export function applyOffsetsToMainView(currentSpriteOffset: any) {
  sprites.value.forEach((sprite, index) => {
    const frameOffset = getSpriteOffset(index);
    if (frameOffset.x !== 0 || frameOffset.y !== 0) {
      // Update the sprite's position to include the offset
      sprite.x += frameOffset.x;
      sprite.y += frameOffset.y;

      // Reset the offset
      frameOffset.x = 0;
      frameOffset.y = 0;
    }
  });

  // Reset current offset
  currentSpriteOffset.x = 0;
  currentSpriteOffset.y = 0;

  // Re-render the main view
  renderSpritesheetPreview();
}